hwcryptokey-test/versioned_keys_explicit.rs - trusty/app/sample - Git at Google

 /*
  * Copyright (C) 2024 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 #[cfg(test)]
 mod tests {
     use android_hardware_security_see_hwcrypto::aidl::android::hardware::security::see::hwcrypto::{
         IHwCryptoKey::{
             DerivedKey::DerivedKey, DerivedKeyParameters::DerivedKeyParameters,
             DerivedKeyPolicy::DerivedKeyPolicy, DeviceKeyId::DeviceKeyId,
             DiceBoundDerivationKey::DiceBoundDerivationKey, DiceBoundKeyResult::DiceBoundKeyResult,
             DiceCurrentBoundKeyResult::DiceCurrentBoundKeyResult, IHwCryptoKey,
             ClearKeyPolicy::ClearKeyPolicy,
         },
     };
     use binder::{StatusCode, Strong};
     use rpcbinder::RpcSession;
     use test::{expect, assert_ok};
     use trusty_std::ffi::{CString, FallibleCString};

     pub(crate) const RUST_DEVICE_KEY_SERVICE_PORT: &str = "com.android.trusty.rust.hwcryptohal.V1";

     pub(crate) const VERSION_0_DICE_POLICY: [u8; 126] = [
         0x83, 0x58, 0x36, 0xa4, 0x01, 0x03, 0x3a, 0x00, 0x01, 0x00, 0x02, 0x58, 0x20, 0x55, 0x51,
         0xba, 0x39, 0x55, 0xfa, 0x6f, 0x92, 0xbb, 0xf9, 0xed, 0xe1, 0xc0, 0x91, 0x3f, 0x2b, 0xbf,
         0xb5, 0xb3, 0x93, 0x8a, 0x08, 0x5f, 0x78, 0xa8, 0x00, 0xa2, 0xce, 0x09, 0x99, 0xa9, 0x5e,
         0x3a, 0x00, 0x01, 0x00, 0x03, 0x01, 0x3a, 0x00, 0x01, 0x00, 0x04, 0x01, 0xa0, 0x58, 0x42,
         0xda, 0x4f, 0xef, 0x97, 0xf4, 0x19, 0x90, 0xf3, 0x06, 0x1f, 0x06, 0xfe, 0x4d, 0xcb, 0x89,
         0xcf, 0x6a, 0xa1, 0xd1, 0xf5, 0x34, 0x68, 0x47, 0x17, 0x2d, 0xa2, 0x0e, 0xec, 0xc1, 0xcb,
         0xac, 0xa4, 0xe1, 0x36, 0x51, 0x88, 0xdb, 0x2e, 0x1c, 0x06, 0xeb, 0xe8, 0x0c, 0xde, 0x56,
         0xc7, 0xed, 0x17, 0x03, 0x2a, 0x9c, 0x4e, 0x52, 0x65, 0xd6, 0x4e, 0xfb, 0xea, 0xf0, 0x9d,
         0x49, 0x70, 0x3f, 0x37, 0xf3, 0x33,
     ];

     pub(crate) const VERSION_0_CLEAR_KEY: [u8; 256] = [
         0xbb, 0x3c, 0xca, 0xca, 0x52, 0x68, 0x05, 0xae, 0xbe, 0xd9, 0x27, 0x98, 0xc8, 0x0e, 0xf0,
         0xbd, 0xfb, 0x03, 0x77, 0x47, 0xe1, 0x68, 0x5b, 0x54, 0xad, 0x42, 0x80, 0x06, 0x83, 0x65,
         0xeb, 0x69, 0x25, 0x22, 0x00, 0x5f, 0x7e, 0xa7, 0x56, 0xe8, 0xce, 0x44, 0x0b, 0xd0, 0x25,
         0xcb, 0x29, 0x50, 0xf2, 0x4e, 0xda, 0x6a, 0xa3, 0x99, 0x47, 0x35, 0x14, 0x08, 0x3b, 0x57,
         0x86, 0xb0, 0xfe, 0x58, 0xb8, 0x23, 0xe8, 0x7c, 0xee, 0x97, 0x84, 0x09, 0x57, 0xa9, 0xc2,
         0xbe, 0xe1, 0xa2, 0xbb, 0xfe, 0xcb, 0x5d, 0xea, 0x01, 0xee, 0x93, 0x66, 0x71, 0xef, 0x5a,
         0x02, 0x34, 0x9e, 0xb8, 0x38, 0xc1, 0x2d, 0xeb, 0x1b, 0xbe, 0x8e, 0x69, 0x6e, 0xbf, 0x82,
         0x72, 0x4e, 0x28, 0x89, 0xda, 0x4a, 0x0c, 0xc4, 0xee, 0x6d, 0xd7, 0x3a, 0x1f, 0xb0, 0x3d,
         0xcc, 0xff, 0x4a, 0x3b, 0x27, 0x49, 0xf3, 0x85, 0xd8, 0x67, 0xcb, 0x4b, 0x92, 0x5f, 0xce,
         0xbb, 0xcb, 0xe1, 0xfe, 0x8a, 0xab, 0xc3, 0x54, 0xce, 0x44, 0xff, 0x36, 0xe1, 0x46, 0xce,
         0x86, 0x25, 0xc0, 0x35, 0xe6, 0x7d, 0xdb, 0xab, 0x2d, 0xfc, 0x7e, 0xeb, 0xb0, 0x93, 0x79,
         0x3d, 0x1b, 0x78, 0x64, 0x0d, 0x6f, 0x35, 0x40, 0xc1, 0xd2, 0x00, 0xfc, 0x2a, 0x14, 0xc3,
         0xc2, 0x0f, 0x10, 0x56, 0x5b, 0x5c, 0xcb, 0xbe, 0x80, 0xdf, 0x08, 0x0d, 0x26, 0x18, 0x8f,
         0xf6, 0x94, 0xf0, 0x8d, 0xb2, 0x29, 0x2e, 0xb9, 0x2d, 0xd0, 0x67, 0x57, 0xea, 0xed, 0x2f,
         0xb0, 0x21, 0xfa, 0x67, 0x42, 0x4a, 0x6a, 0xae, 0xdd, 0x98, 0xc5, 0x1a, 0x6e, 0xf8, 0xfa,
         0xf6, 0x44, 0x7f, 0x2f, 0x88, 0x6f, 0xe1, 0x60, 0x70, 0xa6, 0x08, 0xdf, 0xdf, 0xc1, 0x3f,
         0x8c, 0xed, 0x42, 0x99, 0x15, 0x3b, 0xc7, 0x97, 0x61, 0xcd, 0xf6, 0x65, 0x77, 0xc6, 0x8e,
         0x8d,
     ];

     fn connect() -> Result<Strong<dyn IHwCryptoKey>, StatusCode> {
         let port =
             CString::try_new(RUST_DEVICE_KEY_SERVICE_PORT).expect("Failed to allocate port name");
         RpcSession::new().setup_trusty_client(port.as_c_str())
     }

     fn keys_are_sufficiently_distinct(key1: Vec<u8>, key2: Vec<u8>) -> bool {
         let differing_bytes = key1.iter().zip(key2.iter()).filter(|(&x1, &x2)| x1 != x2).count();

         std::cmp::min(key1.len(), key2.len()) - differing_bytes <= 4
     }

     #[test]
     fn generate_new_policy_and_clear_key() {
         let hw_device_key = connect().expect("couldn't connect to HW Crypto service");

         // Get the device bound key
         let device_bound_key = DiceBoundDerivationKey::KeyId(DeviceKeyId::DEVICE_BOUND_KEY);

         // Generate the current derivation key and policy
         let key_and_policy =
             assert_ok!(hw_device_key.deriveCurrentDicePolicyBoundKey(&device_bound_key));
         let DiceCurrentBoundKeyResult {
             diceBoundKey: derivation_key1,
             dicePolicyForKeyVersion: dice_policy,
         } = key_and_policy;

         expect!(derivation_key1.is_some(), "should have received a key");
         expect!(dice_policy.len() > 0, "should have received a DICE policy");

         // Derive a clear key from returned current policy and derivation key
         let mut params = DerivedKeyParameters {
             derivationKey: derivation_key1,
             keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 256 }),
             context: "context".as_bytes().to_vec(),
         };

         let derived_key1 = assert_ok!(hw_device_key.deriveKey(&params));

         // Check key type and length
         let derived_key1 = match derived_key1 {
             DerivedKey::Opaque(_) => panic!("wrong type of key received"),
             DerivedKey::ExplicitKey(k) => k,
         };

         assert_eq!(derived_key1.len() as i32, 256, "wrong key length");

         // Use dice policy to request same key
         let key_and_policy =
             assert_ok!(hw_device_key.deriveDicePolicyBoundKey(&device_bound_key, &dice_policy));
         let DiceBoundKeyResult {
             diceBoundKey: derivation_key2,
             dicePolicyWasCurrent: dice_policy_current,
         } = key_and_policy;

         expect!(derivation_key2.is_some(), "should have received a key");
         expect!(dice_policy_current, "policy should have been current");

         // generate derived key 2 and compare to key 1
         params.derivationKey = derivation_key2;

         let derived_key2 = assert_ok!(hw_device_key.deriveKey(&params));

         // Check key type and length
         let derived_key2 = match derived_key2 {
             DerivedKey::Opaque(_) => panic!("wrong type of key received"),
             DerivedKey::ExplicitKey(k) => k,
         };

         assert_eq!(derived_key2.len() as i32, 256, "wrong key length");

         // Make sure both derived keys match
         assert_eq!(derived_key2, derived_key1, "key mismatch");

         // If we request current dice policy again, we expect the same key, but different
         // encryption of the returned policy. Note underlying policy is the same (latest),
         // but encrypted byte array returned will be different

         // Generate the current derivation key and policy again
         let key_and_policy =
             assert_ok!(hw_device_key.deriveCurrentDicePolicyBoundKey(&device_bound_key));
         let DiceCurrentBoundKeyResult {
             diceBoundKey: derivation_key3,
             dicePolicyForKeyVersion: dice_policy3,
         } = key_and_policy;

         // We expect the dice policy to appear different due to encruption
         assert_ne!(
             dice_policy, dice_policy3,
             "expected dice policies to appear different due to encryption"
         );

         // Ensure derived key from this policy matches previously generated derived key
         params.derivationKey = derivation_key3;

         let derived_key3 = assert_ok!(hw_device_key.deriveKey(&params));

         // Check key type and length
         let derived_key3 = match derived_key3 {
             DerivedKey::Opaque(_) => panic!("wrong type of key received"),
             DerivedKey::ExplicitKey(k) => k,
         };

         assert_eq!(derived_key3.len() as i32, 256, "wrong key length");

         // Make sure both derived keys match
         assert_eq!(derived_key3, derived_key1, "key mismatch");
     }

     #[test]
     fn old_dice_generates_old_clear_key_and_new_policy() {
         let hw_device_key = connect().expect("couldn't connect to HW Crypto service");

         // Get the device bound key
         let device_bound_key = DiceBoundDerivationKey::KeyId(DeviceKeyId::DEVICE_BOUND_KEY);

         // Generate a derived key from version 0 dice policy
         let key_and_policy = assert_ok!(
             hw_device_key.deriveDicePolicyBoundKey(&device_bound_key, &VERSION_0_DICE_POLICY)
         );
         let DiceBoundKeyResult {
             diceBoundKey: derivation_key,
             dicePolicyWasCurrent: dice_policy_current,
         } = key_and_policy;

         // We expect version 0 should not be current
         expect!(!dice_policy_current, "policy not expected to be current");

         // Derive clear key from derivation key
         let params = DerivedKeyParameters {
             derivationKey: derivation_key,
             keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 256 }),
             context: "context".as_bytes().to_vec(),
         };

         let derived_key = assert_ok!(hw_device_key.deriveKey(&params));

         // Check key type and length
         let derived_key = match derived_key {
             DerivedKey::Opaque(_) => panic!("wrong type of key received"),
             DerivedKey::ExplicitKey(k) => k,
         };

         assert_eq!(derived_key.len() as i32, 256, "wrong key length");

         // Check we got the old key and a new policy
         assert_eq!(derived_key, VERSION_0_CLEAR_KEY.to_vec(), "Retrieved version 0 key mismatch");
     }

     #[test]
     fn dice_updates_are_unique() {
         let hw_device_key = connect().expect("couldn't connect to HW Crypto service");

         // Get the device bound key
         let device_bound_key = DiceBoundDerivationKey::KeyId(DeviceKeyId::DEVICE_BOUND_KEY);

         // Generate a derived key from version 0 dice policy
         let key_and_policy = assert_ok!(
             hw_device_key.deriveDicePolicyBoundKey(&device_bound_key, &VERSION_0_DICE_POLICY)
         );
         let DiceBoundKeyResult {
             diceBoundKey: _derivation_key,
             dicePolicyWasCurrent: dice_policy_current,
         } = key_and_policy;

         // We expect version 0 should not be current
         expect!(!dice_policy_current, "policy not expected to be current");

         // Get current dice policy multiple times
         let key_and_policy =
             assert_ok!(hw_device_key.deriveCurrentDicePolicyBoundKey(&device_bound_key));
         let DiceCurrentBoundKeyResult {
             diceBoundKey: derivation_key1,
             dicePolicyForKeyVersion: dice_policy1,
         } = key_and_policy;

         let key_and_policy =
             assert_ok!(hw_device_key.deriveCurrentDicePolicyBoundKey(&device_bound_key));
         let DiceCurrentBoundKeyResult {
             diceBoundKey: derivation_key2,
             dicePolicyForKeyVersion: dice_policy2,
         } = key_and_policy;

         // policies should appear different due to encryption and not be zero length
         expect!(dice_policy1.len() > 0, "should have received a DICE policy");
         expect!(dice_policy2.len() > 0, "should have received a DICE policy");
         assert_ne!(dice_policy1, dice_policy2, "expected policies to be different");

         expect!(derivation_key1.is_some(), "should have received a key");
         expect!(derivation_key2.is_some(), "should have received a key");

         // Generate derived clear keys from returned derivation keys
         let params = DerivedKeyParameters {
             derivationKey: derivation_key1,
             keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 256 }),
             context: "context".as_bytes().to_vec(),
         };

         let derived_key1 = assert_ok!(hw_device_key.deriveKey(&params));

         let params = DerivedKeyParameters {
             derivationKey: derivation_key2,
             keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 256 }),
             context: "context".as_bytes().to_vec(),
         };

         let derived_key2 = assert_ok!(hw_device_key.deriveKey(&params));

         // Check derived keys
         let derived_key1 = match derived_key1 {
             DerivedKey::Opaque(_) => panic!("wrong type of key received"),
             DerivedKey::ExplicitKey(k) => k,
         };

         let derived_key2 = match derived_key2 {
             DerivedKey::Opaque(_) => panic!("wrong type of key received"),
             DerivedKey::ExplicitKey(k) => k,
         };

         // Check that generated keys match
         assert_eq!(derived_key1, derived_key2, "key mismatch");

         // Check that both dice policies are considered current
         let key_and_policy =
             assert_ok!(hw_device_key.deriveDicePolicyBoundKey(&device_bound_key, &dice_policy1));
         let DiceBoundKeyResult { diceBoundKey: _, dicePolicyWasCurrent: dice_policy1_current } =
             key_and_policy;

         expect!(dice_policy1_current, "policy expected to be current");

         let key_and_policy =
             assert_ok!(hw_device_key.deriveDicePolicyBoundKey(&device_bound_key, &dice_policy2));
         let DiceBoundKeyResult { diceBoundKey: _, dicePolicyWasCurrent: dice_policy2_current } =
             key_and_policy;

         expect!(dice_policy2_current, "policy expected to be current");
     }

     #[test]
     fn explicit_keys_unique_by_context() {
         let hw_device_key = connect().expect("couldn't connect to HW Crypto service");

         // Get the device bound key
         let device_bound_key = DiceBoundDerivationKey::KeyId(DeviceKeyId::DEVICE_BOUND_KEY);

         // Generate the current derivation key and policy
         let key_and_policy =
             assert_ok!(hw_device_key.deriveCurrentDicePolicyBoundKey(&device_bound_key));
         let DiceCurrentBoundKeyResult {
             diceBoundKey: derivation_key,
             dicePolicyForKeyVersion: dice_policy,
         } = key_and_policy;

         expect!(derivation_key.is_some(), "should have received a key");
         expect!(dice_policy.len() > 0, "should have received a DICE policy");

         // Define two different contexts and get clear derived keys for each
         let context1 = "context1";
         let context2 = "context2";

         let params1 = DerivedKeyParameters {
             derivationKey: derivation_key.clone(),
             keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 256 }),
             context: context1.as_bytes().to_vec(),
         };

         let params2 = DerivedKeyParameters {
             derivationKey: derivation_key.clone(),
             keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 256 }),
             context: context2.as_bytes().to_vec(),
         };

         let derived_key1 = assert_ok!(hw_device_key.deriveKey(&params1));
         let derived_key2 = assert_ok!(hw_device_key.deriveKey(&params2));

         // Check key2 type and length
         let derived_key1 = match derived_key1 {
             DerivedKey::Opaque(_) => panic!("wrong type of key received"),
             DerivedKey::ExplicitKey(k) => k,
         };

         let derived_key2 = match derived_key2 {
             DerivedKey::Opaque(_) => panic!("wrong type of key received"),
             DerivedKey::ExplicitKey(k) => k,
         };

         assert_eq!(derived_key1.len() as i32, 256, "wrong key length");
         assert_eq!(derived_key2.len() as i32, 256, "wrong key length");

         // Ensure keys are different
         assert_ne!(derived_key2, derived_key1, "returned keys are same");
         assert!(
             keys_are_sufficiently_distinct(derived_key2, derived_key1),
             "derived keys share too many bytes"
         );
     }

     #[test]
     fn invalid_key_sizes() {
         let hw_device_key = connect().expect("couldn't connect to HW Crypto service");

         // Get the device bound key
         let device_bound_key = DiceBoundDerivationKey::KeyId(DeviceKeyId::DEVICE_BOUND_KEY);

         // Generate the current derivation key and policy
         let key_and_policy =
             assert_ok!(hw_device_key.deriveCurrentDicePolicyBoundKey(&device_bound_key));
         let DiceCurrentBoundKeyResult {
             diceBoundKey: derivation_key,
             dicePolicyForKeyVersion: dice_policy,
         } = key_and_policy;

         expect!(derivation_key.is_some(), "should have received a key");
         expect!(dice_policy.len() > 0, "should have received a DICE policy");

         // Request a zero length key
         let params = DerivedKeyParameters {
             derivationKey: derivation_key.clone(),
             keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 0 }),
             context: "context".as_bytes().to_vec(),
         };

         let derived_key = hw_device_key.deriveKey(&params);
         expect!(derived_key.is_err(), "expected error on bad key size");

         // Request a negative length key
         let params = DerivedKeyParameters {
             derivationKey: derivation_key.clone(),
             keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: -256 }),
             context: "context".as_bytes().to_vec(),
         };

         let derived_key = hw_device_key.deriveKey(&params);
         expect!(derived_key.is_err(), "expected error on bad key size");
     }

     #[test]
     fn large_context() {
         let hw_device_key = connect().expect("couldn't connect to HW Crypto service");

         // Get the device bound key
         let device_bound_key = DiceBoundDerivationKey::KeyId(DeviceKeyId::DEVICE_BOUND_KEY);

         // Generate the current derivation key and policy
         let key_and_policy =
             assert_ok!(hw_device_key.deriveCurrentDicePolicyBoundKey(&device_bound_key));
         let DiceCurrentBoundKeyResult {
             diceBoundKey: derivation_key,
             dicePolicyForKeyVersion: dice_policy,
         } = key_and_policy;

         expect!(derivation_key.is_some(), "should have received a key");
         expect!(dice_policy.len() > 0, "should have received a DICE policy");

         // Pick a reasonable large context size
         const PAYLOAD_LEN: usize = 512;

         let mut context = vec![42; PAYLOAD_LEN];

         // Get a derived key based on large context
         let params = DerivedKeyParameters {
             derivationKey: derivation_key.clone(),
             keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 256 }),
             context: context.clone(),
         };

         let derived_key1 = assert_ok!(hw_device_key.deriveKey(&params));

         // Check key type and length
         let derived_key1 = match derived_key1 {
             DerivedKey::Opaque(_) => panic!("wrong type of key received"),
             DerivedKey::ExplicitKey(k) => k,
         };

         assert_eq!(derived_key1.len() as i32, 256, "wrong key length");

         // Make a minor change to last byte of context and request another key
         context[PAYLOAD_LEN - 1] = 43;

         let params = DerivedKeyParameters {
             derivationKey: derivation_key.clone(),
             keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 256 }),
             context: context.clone(),
         };

         let derived_key2 = assert_ok!(hw_device_key.deriveKey(&params));

         // Check key type and length
         let derived_key2 = match derived_key2 {
             DerivedKey::Opaque(_) => panic!("wrong type of key received"),
             DerivedKey::ExplicitKey(k) => k,
         };

         assert_eq!(derived_key2.len() as i32, 256, "wrong key length");

         //Ensure keys are different
         assert_ne!(derived_key1, derived_key2, "keys expected to differ");
         assert!(
             keys_are_sufficiently_distinct(derived_key1, derived_key2),
             "derived keys share too many bytes"
         );
     }
 }
	/*
	* Copyright (C) 2024 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
	#[cfg(test)]
	mod tests {
	use android_hardware_security_see_hwcrypto::aidl::android::hardware::security::see::hwcrypto::{
	IHwCryptoKey::{
	DerivedKey::DerivedKey, DerivedKeyParameters::DerivedKeyParameters,
	DerivedKeyPolicy::DerivedKeyPolicy, DeviceKeyId::DeviceKeyId,
	DiceBoundDerivationKey::DiceBoundDerivationKey, DiceBoundKeyResult::DiceBoundKeyResult,
	DiceCurrentBoundKeyResult::DiceCurrentBoundKeyResult, IHwCryptoKey,
	ClearKeyPolicy::ClearKeyPolicy,
	},
	};
	use binder::{StatusCode, Strong};
	use rpcbinder::RpcSession;
	use test::{expect, assert_ok};
	use trusty_std::ffi::{CString, FallibleCString};

	pub(crate) const RUST_DEVICE_KEY_SERVICE_PORT: &str = "com.android.trusty.rust.hwcryptohal.V1";

	pub(crate) const VERSION_0_DICE_POLICY: [u8; 126] = [
	0x83, 0x58, 0x36, 0xa4, 0x01, 0x03, 0x3a, 0x00, 0x01, 0x00, 0x02, 0x58, 0x20, 0x55, 0x51,
	0xba, 0x39, 0x55, 0xfa, 0x6f, 0x92, 0xbb, 0xf9, 0xed, 0xe1, 0xc0, 0x91, 0x3f, 0x2b, 0xbf,
	0xb5, 0xb3, 0x93, 0x8a, 0x08, 0x5f, 0x78, 0xa8, 0x00, 0xa2, 0xce, 0x09, 0x99, 0xa9, 0x5e,
	0x3a, 0x00, 0x01, 0x00, 0x03, 0x01, 0x3a, 0x00, 0x01, 0x00, 0x04, 0x01, 0xa0, 0x58, 0x42,
	0xda, 0x4f, 0xef, 0x97, 0xf4, 0x19, 0x90, 0xf3, 0x06, 0x1f, 0x06, 0xfe, 0x4d, 0xcb, 0x89,
	0xcf, 0x6a, 0xa1, 0xd1, 0xf5, 0x34, 0x68, 0x47, 0x17, 0x2d, 0xa2, 0x0e, 0xec, 0xc1, 0xcb,
	0xac, 0xa4, 0xe1, 0x36, 0x51, 0x88, 0xdb, 0x2e, 0x1c, 0x06, 0xeb, 0xe8, 0x0c, 0xde, 0x56,
	0xc7, 0xed, 0x17, 0x03, 0x2a, 0x9c, 0x4e, 0x52, 0x65, 0xd6, 0x4e, 0xfb, 0xea, 0xf0, 0x9d,
	0x49, 0x70, 0x3f, 0x37, 0xf3, 0x33,
	];

	pub(crate) const VERSION_0_CLEAR_KEY: [u8; 256] = [
	0xbb, 0x3c, 0xca, 0xca, 0x52, 0x68, 0x05, 0xae, 0xbe, 0xd9, 0x27, 0x98, 0xc8, 0x0e, 0xf0,
	0xbd, 0xfb, 0x03, 0x77, 0x47, 0xe1, 0x68, 0x5b, 0x54, 0xad, 0x42, 0x80, 0x06, 0x83, 0x65,
	0xeb, 0x69, 0x25, 0x22, 0x00, 0x5f, 0x7e, 0xa7, 0x56, 0xe8, 0xce, 0x44, 0x0b, 0xd0, 0x25,
	0xcb, 0x29, 0x50, 0xf2, 0x4e, 0xda, 0x6a, 0xa3, 0x99, 0x47, 0x35, 0x14, 0x08, 0x3b, 0x57,
	0x86, 0xb0, 0xfe, 0x58, 0xb8, 0x23, 0xe8, 0x7c, 0xee, 0x97, 0x84, 0x09, 0x57, 0xa9, 0xc2,
	0xbe, 0xe1, 0xa2, 0xbb, 0xfe, 0xcb, 0x5d, 0xea, 0x01, 0xee, 0x93, 0x66, 0x71, 0xef, 0x5a,
	0x02, 0x34, 0x9e, 0xb8, 0x38, 0xc1, 0x2d, 0xeb, 0x1b, 0xbe, 0x8e, 0x69, 0x6e, 0xbf, 0x82,
	0x72, 0x4e, 0x28, 0x89, 0xda, 0x4a, 0x0c, 0xc4, 0xee, 0x6d, 0xd7, 0x3a, 0x1f, 0xb0, 0x3d,
	0xcc, 0xff, 0x4a, 0x3b, 0x27, 0x49, 0xf3, 0x85, 0xd8, 0x67, 0xcb, 0x4b, 0x92, 0x5f, 0xce,
	0xbb, 0xcb, 0xe1, 0xfe, 0x8a, 0xab, 0xc3, 0x54, 0xce, 0x44, 0xff, 0x36, 0xe1, 0x46, 0xce,
	0x86, 0x25, 0xc0, 0x35, 0xe6, 0x7d, 0xdb, 0xab, 0x2d, 0xfc, 0x7e, 0xeb, 0xb0, 0x93, 0x79,
	0x3d, 0x1b, 0x78, 0x64, 0x0d, 0x6f, 0x35, 0x40, 0xc1, 0xd2, 0x00, 0xfc, 0x2a, 0x14, 0xc3,
	0xc2, 0x0f, 0x10, 0x56, 0x5b, 0x5c, 0xcb, 0xbe, 0x80, 0xdf, 0x08, 0x0d, 0x26, 0x18, 0x8f,
	0xf6, 0x94, 0xf0, 0x8d, 0xb2, 0x29, 0x2e, 0xb9, 0x2d, 0xd0, 0x67, 0x57, 0xea, 0xed, 0x2f,
	0xb0, 0x21, 0xfa, 0x67, 0x42, 0x4a, 0x6a, 0xae, 0xdd, 0x98, 0xc5, 0x1a, 0x6e, 0xf8, 0xfa,
	0xf6, 0x44, 0x7f, 0x2f, 0x88, 0x6f, 0xe1, 0x60, 0x70, 0xa6, 0x08, 0xdf, 0xdf, 0xc1, 0x3f,
	0x8c, 0xed, 0x42, 0x99, 0x15, 0x3b, 0xc7, 0x97, 0x61, 0xcd, 0xf6, 0x65, 0x77, 0xc6, 0x8e,
	0x8d,
	];

	fn connect() -> Result<Strong<dyn IHwCryptoKey>, StatusCode> {
	let port =
	CString::try_new(RUST_DEVICE_KEY_SERVICE_PORT).expect("Failed to allocate port name");
	RpcSession::new().setup_trusty_client(port.as_c_str())
	}

	fn keys_are_sufficiently_distinct(key1: Vec<u8>, key2: Vec<u8>) -> bool {
	let differing_bytes = key1.iter().zip(key2.iter()).filter(\|(&x1, &x2)\| x1 != x2).count();

	std::cmp::min(key1.len(), key2.len()) - differing_bytes <= 4
	}

	#[test]
	fn generate_new_policy_and_clear_key() {
	let hw_device_key = connect().expect("couldn't connect to HW Crypto service");

	// Get the device bound key
	let device_bound_key = DiceBoundDerivationKey::KeyId(DeviceKeyId::DEVICE_BOUND_KEY);

	// Generate the current derivation key and policy
	let key_and_policy =
	assert_ok!(hw_device_key.deriveCurrentDicePolicyBoundKey(&device_bound_key));
	let DiceCurrentBoundKeyResult {
	diceBoundKey: derivation_key1,
	dicePolicyForKeyVersion: dice_policy,
	} = key_and_policy;

	expect!(derivation_key1.is_some(), "should have received a key");
	expect!(dice_policy.len() > 0, "should have received a DICE policy");

	// Derive a clear key from returned current policy and derivation key
	let mut params = DerivedKeyParameters {
	derivationKey: derivation_key1,
	keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 256 }),
	context: "context".as_bytes().to_vec(),
	};

	let derived_key1 = assert_ok!(hw_device_key.deriveKey(&params));

	// Check key type and length
	let derived_key1 = match derived_key1 {
	DerivedKey::Opaque(_) => panic!("wrong type of key received"),
	DerivedKey::ExplicitKey(k) => k,
	};

	assert_eq!(derived_key1.len() as i32, 256, "wrong key length");

	// Use dice policy to request same key
	let key_and_policy =
	assert_ok!(hw_device_key.deriveDicePolicyBoundKey(&device_bound_key, &dice_policy));
	let DiceBoundKeyResult {
	diceBoundKey: derivation_key2,
	dicePolicyWasCurrent: dice_policy_current,
	} = key_and_policy;

	expect!(derivation_key2.is_some(), "should have received a key");
	expect!(dice_policy_current, "policy should have been current");

	// generate derived key 2 and compare to key 1
	params.derivationKey = derivation_key2;

	let derived_key2 = assert_ok!(hw_device_key.deriveKey(&params));

	// Check key type and length
	let derived_key2 = match derived_key2 {
	DerivedKey::Opaque(_) => panic!("wrong type of key received"),
	DerivedKey::ExplicitKey(k) => k,
	};

	assert_eq!(derived_key2.len() as i32, 256, "wrong key length");

	// Make sure both derived keys match
	assert_eq!(derived_key2, derived_key1, "key mismatch");

	// If we request current dice policy again, we expect the same key, but different
	// encryption of the returned policy. Note underlying policy is the same (latest),
	// but encrypted byte array returned will be different

	// Generate the current derivation key and policy again
	let key_and_policy =
	assert_ok!(hw_device_key.deriveCurrentDicePolicyBoundKey(&device_bound_key));
	let DiceCurrentBoundKeyResult {
	diceBoundKey: derivation_key3,
	dicePolicyForKeyVersion: dice_policy3,
	} = key_and_policy;

	// We expect the dice policy to appear different due to encruption
	assert_ne!(
	dice_policy, dice_policy3,
	"expected dice policies to appear different due to encryption"
	);

	// Ensure derived key from this policy matches previously generated derived key
	params.derivationKey = derivation_key3;

	let derived_key3 = assert_ok!(hw_device_key.deriveKey(&params));

	// Check key type and length
	let derived_key3 = match derived_key3 {
	DerivedKey::Opaque(_) => panic!("wrong type of key received"),
	DerivedKey::ExplicitKey(k) => k,
	};

	assert_eq!(derived_key3.len() as i32, 256, "wrong key length");

	// Make sure both derived keys match
	assert_eq!(derived_key3, derived_key1, "key mismatch");
	}

	#[test]
	fn old_dice_generates_old_clear_key_and_new_policy() {
	let hw_device_key = connect().expect("couldn't connect to HW Crypto service");

	// Get the device bound key
	let device_bound_key = DiceBoundDerivationKey::KeyId(DeviceKeyId::DEVICE_BOUND_KEY);

	// Generate a derived key from version 0 dice policy
	let key_and_policy = assert_ok!(
	hw_device_key.deriveDicePolicyBoundKey(&device_bound_key, &VERSION_0_DICE_POLICY)
	);
	let DiceBoundKeyResult {
	diceBoundKey: derivation_key,
	dicePolicyWasCurrent: dice_policy_current,
	} = key_and_policy;

	// We expect version 0 should not be current
	expect!(!dice_policy_current, "policy not expected to be current");

	// Derive clear key from derivation key
	let params = DerivedKeyParameters {
	derivationKey: derivation_key,
	keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 256 }),
	context: "context".as_bytes().to_vec(),
	};

	let derived_key = assert_ok!(hw_device_key.deriveKey(&params));

	// Check key type and length
	let derived_key = match derived_key {
	DerivedKey::Opaque(_) => panic!("wrong type of key received"),
	DerivedKey::ExplicitKey(k) => k,
	};

	assert_eq!(derived_key.len() as i32, 256, "wrong key length");

	// Check we got the old key and a new policy
	assert_eq!(derived_key, VERSION_0_CLEAR_KEY.to_vec(), "Retrieved version 0 key mismatch");
	}

	#[test]
	fn dice_updates_are_unique() {
	let hw_device_key = connect().expect("couldn't connect to HW Crypto service");

	// Get the device bound key
	let device_bound_key = DiceBoundDerivationKey::KeyId(DeviceKeyId::DEVICE_BOUND_KEY);

	// Generate a derived key from version 0 dice policy
	let key_and_policy = assert_ok!(
	hw_device_key.deriveDicePolicyBoundKey(&device_bound_key, &VERSION_0_DICE_POLICY)
	);
	let DiceBoundKeyResult {
	diceBoundKey: _derivation_key,
	dicePolicyWasCurrent: dice_policy_current,
	} = key_and_policy;

	// We expect version 0 should not be current
	expect!(!dice_policy_current, "policy not expected to be current");

	// Get current dice policy multiple times
	let key_and_policy =
	assert_ok!(hw_device_key.deriveCurrentDicePolicyBoundKey(&device_bound_key));
	let DiceCurrentBoundKeyResult {
	diceBoundKey: derivation_key1,
	dicePolicyForKeyVersion: dice_policy1,
	} = key_and_policy;

	let key_and_policy =
	assert_ok!(hw_device_key.deriveCurrentDicePolicyBoundKey(&device_bound_key));
	let DiceCurrentBoundKeyResult {
	diceBoundKey: derivation_key2,
	dicePolicyForKeyVersion: dice_policy2,
	} = key_and_policy;

	// policies should appear different due to encryption and not be zero length
	expect!(dice_policy1.len() > 0, "should have received a DICE policy");
	expect!(dice_policy2.len() > 0, "should have received a DICE policy");
	assert_ne!(dice_policy1, dice_policy2, "expected policies to be different");

	expect!(derivation_key1.is_some(), "should have received a key");
	expect!(derivation_key2.is_some(), "should have received a key");

	// Generate derived clear keys from returned derivation keys
	let params = DerivedKeyParameters {
	derivationKey: derivation_key1,
	keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 256 }),
	context: "context".as_bytes().to_vec(),
	};

	let derived_key1 = assert_ok!(hw_device_key.deriveKey(&params));

	let params = DerivedKeyParameters {
	derivationKey: derivation_key2,
	keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 256 }),
	context: "context".as_bytes().to_vec(),
	};

	let derived_key2 = assert_ok!(hw_device_key.deriveKey(&params));

	// Check derived keys
	let derived_key1 = match derived_key1 {
	DerivedKey::Opaque(_) => panic!("wrong type of key received"),
	DerivedKey::ExplicitKey(k) => k,
	};

	let derived_key2 = match derived_key2 {
	DerivedKey::Opaque(_) => panic!("wrong type of key received"),
	DerivedKey::ExplicitKey(k) => k,
	};

	// Check that generated keys match
	assert_eq!(derived_key1, derived_key2, "key mismatch");

	// Check that both dice policies are considered current
	let key_and_policy =
	assert_ok!(hw_device_key.deriveDicePolicyBoundKey(&device_bound_key, &dice_policy1));
	let DiceBoundKeyResult { diceBoundKey: _, dicePolicyWasCurrent: dice_policy1_current } =
	key_and_policy;

	expect!(dice_policy1_current, "policy expected to be current");

	let key_and_policy =
	assert_ok!(hw_device_key.deriveDicePolicyBoundKey(&device_bound_key, &dice_policy2));
	let DiceBoundKeyResult { diceBoundKey: _, dicePolicyWasCurrent: dice_policy2_current } =
	key_and_policy;

	expect!(dice_policy2_current, "policy expected to be current");
	}

	#[test]
	fn explicit_keys_unique_by_context() {
	let hw_device_key = connect().expect("couldn't connect to HW Crypto service");

	// Get the device bound key
	let device_bound_key = DiceBoundDerivationKey::KeyId(DeviceKeyId::DEVICE_BOUND_KEY);

	// Generate the current derivation key and policy
	let key_and_policy =
	assert_ok!(hw_device_key.deriveCurrentDicePolicyBoundKey(&device_bound_key));
	let DiceCurrentBoundKeyResult {
	diceBoundKey: derivation_key,
	dicePolicyForKeyVersion: dice_policy,
	} = key_and_policy;

	expect!(derivation_key.is_some(), "should have received a key");
	expect!(dice_policy.len() > 0, "should have received a DICE policy");

	// Define two different contexts and get clear derived keys for each
	let context1 = "context1";
	let context2 = "context2";

	let params1 = DerivedKeyParameters {
	derivationKey: derivation_key.clone(),
	keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 256 }),
	context: context1.as_bytes().to_vec(),
	};

	let params2 = DerivedKeyParameters {
	derivationKey: derivation_key.clone(),
	keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 256 }),
	context: context2.as_bytes().to_vec(),
	};

	let derived_key1 = assert_ok!(hw_device_key.deriveKey(&params1));
	let derived_key2 = assert_ok!(hw_device_key.deriveKey(&params2));

	// Check key2 type and length
	let derived_key1 = match derived_key1 {
	DerivedKey::Opaque(_) => panic!("wrong type of key received"),
	DerivedKey::ExplicitKey(k) => k,
	};

	let derived_key2 = match derived_key2 {
	DerivedKey::Opaque(_) => panic!("wrong type of key received"),
	DerivedKey::ExplicitKey(k) => k,
	};

	assert_eq!(derived_key1.len() as i32, 256, "wrong key length");
	assert_eq!(derived_key2.len() as i32, 256, "wrong key length");

	// Ensure keys are different
	assert_ne!(derived_key2, derived_key1, "returned keys are same");
	assert!(
	keys_are_sufficiently_distinct(derived_key2, derived_key1),
	"derived keys share too many bytes"
	);
	}

	#[test]
	fn invalid_key_sizes() {
	let hw_device_key = connect().expect("couldn't connect to HW Crypto service");

	// Get the device bound key
	let device_bound_key = DiceBoundDerivationKey::KeyId(DeviceKeyId::DEVICE_BOUND_KEY);

	// Generate the current derivation key and policy
	let key_and_policy =
	assert_ok!(hw_device_key.deriveCurrentDicePolicyBoundKey(&device_bound_key));
	let DiceCurrentBoundKeyResult {
	diceBoundKey: derivation_key,
	dicePolicyForKeyVersion: dice_policy,
	} = key_and_policy;

	expect!(derivation_key.is_some(), "should have received a key");
	expect!(dice_policy.len() > 0, "should have received a DICE policy");

	// Request a zero length key
	let params = DerivedKeyParameters {
	derivationKey: derivation_key.clone(),
	keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 0 }),
	context: "context".as_bytes().to_vec(),
	};

	let derived_key = hw_device_key.deriveKey(&params);
	expect!(derived_key.is_err(), "expected error on bad key size");

	// Request a negative length key
	let params = DerivedKeyParameters {
	derivationKey: derivation_key.clone(),
	keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: -256 }),
	context: "context".as_bytes().to_vec(),
	};

	let derived_key = hw_device_key.deriveKey(&params);
	expect!(derived_key.is_err(), "expected error on bad key size");
	}

	#[test]
	fn large_context() {
	let hw_device_key = connect().expect("couldn't connect to HW Crypto service");

	// Get the device bound key
	let device_bound_key = DiceBoundDerivationKey::KeyId(DeviceKeyId::DEVICE_BOUND_KEY);

	// Generate the current derivation key and policy
	let key_and_policy =
	assert_ok!(hw_device_key.deriveCurrentDicePolicyBoundKey(&device_bound_key));
	let DiceCurrentBoundKeyResult {
	diceBoundKey: derivation_key,
	dicePolicyForKeyVersion: dice_policy,
	} = key_and_policy;

	expect!(derivation_key.is_some(), "should have received a key");
	expect!(dice_policy.len() > 0, "should have received a DICE policy");

	// Pick a reasonable large context size
	const PAYLOAD_LEN: usize = 512;

	let mut context = vec![42; PAYLOAD_LEN];

	// Get a derived key based on large context
	let params = DerivedKeyParameters {
	derivationKey: derivation_key.clone(),
	keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 256 }),
	context: context.clone(),
	};

	let derived_key1 = assert_ok!(hw_device_key.deriveKey(&params));

	// Check key type and length
	let derived_key1 = match derived_key1 {
	DerivedKey::Opaque(_) => panic!("wrong type of key received"),
	DerivedKey::ExplicitKey(k) => k,
	};

	assert_eq!(derived_key1.len() as i32, 256, "wrong key length");

	// Make a minor change to last byte of context and request another key
	context[PAYLOAD_LEN - 1] = 43;

	let params = DerivedKeyParameters {
	derivationKey: derivation_key.clone(),
	keyPolicy: DerivedKeyPolicy::ClearKey(ClearKeyPolicy { keySizeBytes: 256 }),
	context: context.clone(),
	};

	let derived_key2 = assert_ok!(hw_device_key.deriveKey(&params));

	// Check key type and length
	let derived_key2 = match derived_key2 {
	DerivedKey::Opaque(_) => panic!("wrong type of key received"),
	DerivedKey::ExplicitKey(k) => k,
	};

	assert_eq!(derived_key2.len() as i32, 256, "wrong key length");

	//Ensure keys are different
	assert_ne!(derived_key1, derived_key2, "keys expected to differ");
	assert!(
	keys_are_sufficiently_distinct(derived_key1, derived_key2),
	"derived keys share too many bytes"
	);
	}
	}